Position sensors are critical components of any AMB system. The position sensors continuously provide the MBC (Magnetic Bearing Controller) with accurate and up-to-date information about the rotor position unaffected by external factors, such as speed, temperature, dust, working fluids, external magnetic, electrical fields, etc. While conventional magnetic reluctance sensors, seen in competing designs, work very well for measuring radial displacements, measurement of the axial displacements is often much more challenging. To address those challenges, Calnetix developed a unique constant-flux edge sensor with clear performance advantages, including:

  • Immunity to external magnetic fields and radial displacements
  • Excellent temperature stability
  • Total measurement range in excess of 0.2" (5mm) with a linear sub-range with less than 15% non-linearity in excess of 0.08" (2mm)
  • Pass-through rotor assembly
  • High raw gain in order of 100V/in (4V/mm)